Which of the following is the edge between the private and locally managed-and-owned side of a
network and the public side that is commonly managed by a service provider?

A.
Internet

B.
Network perimeter

C.
Intranet

D.
VLAN

Explanation:
A network perimeter is the edge between the private and locally managed-and-owned side of a
network and the public side that is commonly managed by a service provider. In an efficient
enterprise security design, the network perimeter offers a great opportunity for enhancing the
security position of a network. The network perimeter consists of a Border Network and a Perimeter
Network; each assumes an enforcement point within the network perimeter with each having a
exclusive responsibility in the perimeter security model.

Answer C is incorrect. An intranet is a private network that is contained within an enterprise.
Intranet is used to share company information and computing resources among employees. It is also
used to facilitate working in groups and for teleconferencing. An intranet uses TCP/IP, HTTP, and
other Internet protocols.

Answer D is incorrect. A VLAN is a broadcast domain created by a switch. Each broadcast domain
connected to interfaces of the switch is known as a separate VLAN. A VLAN should be configured
when a LAN has lots of traffic or more than 200 devices. It is also required when groups of users
need more security or when a group of users has the same type of work and needs to be on the
same broadcast domain.

Answer A is incorrect. Internet is a global network of computers, connected to each other using the
TCP/IP protocol. Internet sites are available to all users. The Internet, sometimes called simply “the

Net,” is a worldwide system of computer networks – a network of networks in which users at any
one computer can, if they have permission, get information from any other computer (and
sometimes talk directly to users at other computers). It was conceived by the Advanced Research
Projects Agency (ARPA) of the U.S. government in 1969 and was first known as the ARPANET.
Today, the Internet is a public, cooperative, and self-sustaining facility accessible to hundreds of
millions of people worldwide. Physically, the Internet uses a portion of the total resources of the
currently existing public telecommunication networks. Technically, what distinguishes the Internet is
its use of a set of protocols called TCP/IP (for Transmission Control Protocol/Internet Protocol).